UD5 Toolkit
Mosaic Tile Calculator – Online Tessera Size & Grout Gap
Enter mosaic area and choose tessera size to find the approximate number of tiles required. Includes grout joint factor.
Brake Rotor Size Calculator - Online Car Maintenance
Brake Rotor Size Calculator
Determine the maximum brake rotor diameter for your wheels, or find the minimum rim size needed for a desired rotor upgrade. Built for DIY mechanics and performance enthusiasts who want safe, precise fitment.
inches
Enter your wheel (rim) diameter, e.g., 17, 18, 19.
1.5″
Typical safe clearance is 1.5″ total (0.75″ per side). Adjust based on your caliper space.
Max Rotor Diameter:
393.7 mm
15.50″
mm
Enter the brake rotor diameter you want to install.
1.5″
Same clearance concept: rotor must fit inside rim with space for caliper.
Minimum Recommended Rim Diameter:
15.0″
(exact: 14.99″)
Reference Chart
| Rim Size (in) | Max Rotor (mm) | Max Rotor (in) |
|---|
Values based on current clearance setting (1.5″ total reduction).
Frequently Asked Questions
A brake rotor size calculator helps you determine the maximum rotor diameter that fits inside a given wheel rim, or the minimum rim size required for a specific rotor. This is essential when upgrading brakes to ensure proper clearance without interference.
A general rule of thumb is to allow at least 1.5 inches (38 mm) total diameter reduction from the rim size to the rotor. This accounts for caliper body thickness, mounting brackets, and safe running clearance. Some high‑performance calipers may require more space, so always measure your specific setup.
Yes, as long as the rotor diameter remains below the max allowed size for your current rims (calculated here). However, you must also check spoke clearance, caliper bracket compatibility, and wheel offset. When in doubt, consult a professional.
Larger rotors provide greater braking torque (more leverage), better heat dissipation, and improved fade resistance. They are a key upgrade for towing, track use, or simply enhancing safety. However, they require wheel clearance and often larger calipers.
Use a caliper or measuring tape across the rotor’s outer edge (friction surface). Do not include the hat or mounting flange. Factory specifications are also available in your vehicle’s service manual or online parts catalog.
A 330 mm brake rotor (approx. 13″) typically requires at least a 15‑inch rim when using a 1.5″ total clearance. Use our “Rim from Rotor” tab to get an exact recommendation based on your clearance needs.
Quilt Fabric Calculator - Online Yardage & Block Count
Calculate how much fabric you need for a quilt based on block size, number, and sashing. Supports metric and imperial. No upload, local.
Aquarium Bioload Calculator – Online Stocking Level Indicator
Add fish species and sizes to estimate the bioload and check if your tank is overstocked. Inch‑per‑gallon model.
Soap Recipe Calculator - Online Lye & Oil Saponification
Create a custom soap recipe by selecting oils and their percentages. Get precise lye and water amounts. Safety warnings included.
Airbrush Paint Thinner Calculator – Online Acrylic/Enamel Ratio
Select paint type and brand to get the recommended thinning ratio for airbrush. Achieve smooth, clog-free spraying.
Quilt Binding Yardage Calculator – Online Bias & Straight Grain
Enter quilt perimeter, binding width, and seam allowance to get the exact fabric yardage for either straight‑grain or bias binding.
Leftover Paint Coverage Calculator – Online Touch‑Up Planning
Enter the amount of leftover paint and see how many square feet it still covers. Plan touch-ups.
Yarn Substitution Tool – Online Match Gauge & Yardage
When a yarn is discontinued, find equivalent alternatives by matching weight and gauge. Local reference.
Spray Paint Distance & Coverage Calculator – Online Even Coat Tool
Enter nozzle type and surface area to get optimal spray distance, sweep speed, and estimated cans needed. Prevent runs and drips.
Engine Oil Capacity Lookup – Online Quarts & Filter Type
Find your car's engine oil capacity and recommended filter part number. Quick reference for DIY oil change.
Roof Snow Load Estimator – Online Ground Snow & Pitch Factor
Enter ground snow load and roof pitch to estimate the effective snow load on a sloped roof. Quick structural check for snowy regions.
Website Carbon Footprint Estimator - Online Eco Check
Enter a URL and get a rough estimate of its carbon emissions per page view. Based on data transfer size and energy model. Educational.
Grocery Cost Estimator - Online Budget Your Weekly Cart
Build a virtual grocery list with estimated prices and see total before you shop. Adjust quantities, mark bought items. Data stays in browser.
Tufting Yarn Weight Estimator – Online Punch Needle Pile Height
Enter design area and pile height to estimate pounds of yarn needed for a tufted rug. Surprising how much yarn it takes.
Paint Thinner Mix Calculator – Online Viscosity Ratio
Calculate how much thinner to add to achieve the right viscosity for spray guns. Common ratios.
Tip Pool Calculator - Online Fair Share Splitter for Staff
Fairly distribute pooled tips among staff based on hours worked or points. Customizable percentages. All calculations local and private.
Cheese Curd Cutting Size Guide – Online Visual Cubes
Select cheese type (cheddar, brie) to see recommended curd cut size and visual cube comparison.
Web Worker Fibonacci Demo - Online Non‑Blocking Calculation
Calculate large Fibonacci numbers in a Web Worker. See the UI remain responsive. Copy the pattern for your app.
Electricity Cost Estimator - Online Appliance Running Expense
Calculate daily/monthly/yearly electricity cost of any appliance based on wattage, hours used, and your kWh rate. Compare multiple devices. Fully offline.
W‑4 Withholding Estimator – Online Simple Tax Refund Checker
Enter income, pay frequency, and expected deductions to estimate your tax refund or balance due. Simplified model.
Jigsaw Blade Selector – Online Material, Thickness & TPI Guide
Choose sawing material and thickness to get the correct blade type, TPI, and shank. Prevents burning and rough cuts.
Sanding Grit Progression Planner – Online Woodworking Surface Prep
Select starting and ending surface condition to get an optimal sandpaper grit sequence. Never skip a grit again and achieve a flawless wood finish.
Bow Sight Pin Gap Estimator – Online Multi‑Pin Setup Tool
Enter your first pin distance and arrow speed to estimate gaps for 30, 40, 50, 60 yard pins. Start practice.
Knitting Stitch Counter & Row Progress Tracker
Keep track of stitches and rows for your knitting projects. Multiple counters with increase/decrease shortcuts. Data saved in your browser.
Soap Superfat & Lye Purity Adjuster – Online Cold Process Calc
Adjust your lye amount based on lye purity (KOH/NaOH) and desired superfat percentage. Provides safety check for handmade soap recipes.
Paint Coverage Estimator - Online Wall Area & Cans Needed
Input room dimensions and number of coats to estimate how many gallons/litres of paint you need. Excludes doors/windows optionally. Local calculator.
Window Size Detector - Online Outer & Inner Dimensions
See outerWidth, innerWidth, outerHeight, innerHeight, screenX/Y, and availWidth/Height live. Understand the viewport.
Sewing Pattern Layout Optimizer - Online Minimize Waste
Place rectangular pattern pieces on a virtual fabric width to optimize cutting layout and reduce waste. Simple manual drag & drop. Local only.
Image Pixelator - Online Censor & Mosaic Effect Tool
Pixelate or censor parts of an image by dragging. Adjust block size for mosaic effect. Useful for hiding faces or sensitive data. Client-side processing.
Airlock Activity Rate Estimator – Online Bubbles per Minute to CO2
Count bubbles per minute to estimate fermentation activity and approximate sugar consumption. Simple conversion.